Re: [osg-users] Vertex picker - multiple selection
Hi, A naïve approach would be to use a LineSegmentIntersector towards each of the points selected by the PolytopeIntersector (let's call this point P). If P is not the first intersection found by the LineSegmentIntersector (that is, it is not the closest to the camera), it means that there is something occluding it (AKA it is not visible). I suppose this could easily become too inefficient if you have too many points, though. LMB On Fri, Nov 25, 2011 at 8:23 AM, Aurelien Albert aurelien.alb...@alyotech.fr wrote: Hi, I'm working on an application which allows the user to edit some vertex data (vertex attributes array). To edit a vertex data, user pick it and edit values in a popup. I made multiple selection by picking multiple vertices holding shift key : Shift + clic add a vertex to current selection. I would like to make a rubber band selection. Look at the screen shot : the aim is to select all vertices in the red rubber band. I think I can do this with a polytope intersector, but I have a problem : I don't want to select all vertices that are in the polytope, only the vertices that are visible to the user. Any idea on how can I do that ? Thanks ! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44034#44034 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Vertex picker - multiple selection
Hi, That's naive, but it's also a good idea, I'll try that Aurelien -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44038#44038 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Vertex picker - multiple selection
Hum... there's still a problem...
how can I retrieve intersected vertices from polytope intersection ?
From a LineSegmentIntersector, I use this code :
Code:
intersection is a osgUtil::LineSegmentIntersector::Intersection instance from
LineSegmentIntersector
osg::Geometry* pGeometry =
dynamic_castosg::Geometry*(intersection.drawable.get());
if (pGeometry != NULL)
{
osg::ref_ptrosg::Vec3Array pVertexArray =
dynamic_castosg::Vec3Array*(pGeometry-getVertexArray());
if (pVertexArray != NULL)
{
for (unsigned int i=0; iintersection.indexList.size(); i++)
{
if ( (nearestVertexIndex = 0) (nearestVertexIndex
(int) pVertexArray-size()) )
{
addVertexToSelection(pGeometry,
nearestVertexIndex);
}
}
}
}
--
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http://forum.openscenegraph.org/viewtopic.php?p=44043#44043
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Re: [osg-users] Vertex picker - multiple selection
I've only used PolytopeIntersector to deal with point clouds. In this
case, osgUtil::PolytopeIntersector::getIntersections() returns what I
need (that is, all the points inside the polytope). I don't know,
however, what exactly it counts as intersections when dealing with
polygons. :-/
LMB
On Fri, Nov 25, 2011 at 1:37 PM, Aurelien Albert
aurelien.alb...@alyotech.fr wrote:
Hum... there's still a problem...
how can I retrieve intersected vertices from polytope intersection ?
From a LineSegmentIntersector, I use this code :
Code:
intersection is a osgUtil::LineSegmentIntersector::Intersection instance from
LineSegmentIntersector
osg::Geometry* pGeometry =
dynamic_castosg::Geometry*(intersection.drawable.get());
if (pGeometry != NULL)
{
osg::ref_ptrosg::Vec3Array pVertexArray =
dynamic_castosg::Vec3Array*(pGeometry-getVertexArray());
if (pVertexArray != NULL)
{
for (unsigned int i=0; iintersection.indexList.size(); i++)
{
if ( (nearestVertexIndex = 0) (nearestVertexIndex
(int) pVertexArray-size()) )
{
addVertexToSelection(pGeometry,
nearestVertexIndex);
}
}
}
}
--
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=44043#44043
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